How to maintain the audiometer of the hearing aid fitter
The audiometer is a precision measuring instrument that must be maintained in a regular, comprehensive calibration to ensure correct hearing test results. Here, the auditory has some basic common sense for the daily listening and listening test of the audiometer. Although the daily listening test is simple, no special equipment is needed, but its function is no less than electroacoustic calibration. Our experience is that the audiometer has at least80%The problem is that it can be found through daily inspections and can be resolved immediately. This is a useful program that doesn’t cost money or time.
First of all, we need to emphasize that before starting the machine every day, we should follow the instructions of the audiometer manufacturer to ensure that the instrument has sufficient warm-up time, which usually takes about ten minutes. If it is in the cold zone, it may take longer to make the audiometer stable. Working status. Some audiometers may require different voltages and should be used with the correct transformer. For battery-powered audiometers, check the battery storage status. Then, you should check that the audiometer and related connecting wires are properly connected, including the wires and plugs on the adapter, the socket cable, etc., to avoid breakage or misconnection. It should be ensured that the audiometer and related accessories, such as earphone pads, earplugs, main conductors and other wires, are regularly cleaned and inspected for wear or damage. In particular, it is necessary to pay attention to whether the tension of the headband of the earphone and the head of the bone vibrator is normal.
After booting up, it is recommended to first listen to the audiometer whether it is in normal working condition, whether the sound is distorted, distorted, intermittent, whether there are other noises or “clicks”. Check if the output of the transducer and bone oscillator used is changed by the adjustment of the attenuator and the frequency regulator, such as when the frequency regulator is adjusted8000HzWhen, can our human ear hear high-frequency sounds, and vice versa, when it is lowered to250HzWhen can we hear obvious frequency changes and so on. At the same time, it is necessary to check whether various test signal sources output corresponding signals as required, such as pure tone, masking noise, speech signal, and the like. Carefully check the test button of the audiometer. Observe that the indicators and indicators are displayed properly. Try to see if the subject’s feedback signal system is normal.
Finally, it is recommended to choose a few basic frequencies to quickly perform a simple biometric calibration. Select a test frequency and give20dBHLThe sound signal, listening to it yourself, can hear the lowest test sound, the so-called “just hear” minimum sound. Record the hearing level that can be heard, and the difference should not exceed the hearing threshold at the same frequency as you know.10 dBHLJust fine. In this way, quickly check the two headphones and the bone vibrator. At the same time, listen to whether there is a voice or other AC sound. All of the above inspections should have a complete current day record and should include various measurement results and data on calibration deviations. Once the error is found to be large, or there is a significant failure, the manufacturer should be contacted immediately, and more in-depth calibration and necessary maintenance should be carried out in time to suspend clinical audiometry.
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